Some things about programming, design and methodologies, both in English and in Russian. Translation of some articles that I like into Russian.
Некоторые мысли о программировании, архитектуре и методологиях. Перевод понравившихся статей на Русский.

Answer: To use approach suggested in ThreadLocal class javadocs. In this way we receive clear 2-indeger index without need to create list in business code. Similar approach could be applied to Maps.
It's simpler than creating separate business object and still readable and expressive.